On Sat, 30 Mar 2013, Wander Lairson Costa wrote:
> 2013/3/29 Alan Stern <st...@rowland.harvard.edu>:
> > On Fri, 29 Mar 2013, Wander Lairson Costa wrote:
> >
> >> Dear all,
> >>
> >> I have a (kind of dumb) question regarding libusb_bulk_transfer and
> >> libusb_interrupt_transfer functions. These functions don't receive any
> >> interface related information in their parameters, so, which interface
> >> they will send/receive data to/from?
> >
> > They _do_ receive interface-related information in their parameters:
> > the endpoint address. Each endpoint belongs to a single interface.
> >
>
> You mean, I cannot have endpoint 1 both on interface 0 and interface
> 1? I was not aware of that.
It is mentioned explicitly in section 9.6.3 of the USB-2 spec:
An endpoint is not shared among interfaces within a single
configuration unless the endpoint is used by alternate settings
of the same interface. Endpoints may be shared among
interfaces that are part of different configurations without
this restriction.
Alan Stern
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